Henry f



(No Model.)

H. F. CAMPBELL.

HOOP DRESSING MACHINE.

I No. 519,401. Patented May 8, 1894.

' UNITED" STATES PATENT ()FFICE.

HENRY F. CAMPBELL, OF MALDEN, MASSACHUSETTS, ASSIGNOR TO GEO. B.

' JAMES, TRUSTEE.

HOOP-DRESSING MACHINE.

SPECIFICATION forming part of Letters Patent No. 519, 101 dated May 8, 1894.

Application filed April 3, 1888- Serial No. 269,434- (No model.) I

To all whom it may concern.-

Be it known that I, HENRY F. CAMPBELL, of Malden, county of Middlesex, State of Massachusetts, have invented an Improvement in Hoop-Dressing Machines, of which the following description, in connection with the accompanyingdrawings, is a specification, like letters on the drawings representing like parts.

This invention relates to hoop dressing machines, and is an improvement upon the class of hoop dressing machines substantially such as shown in United States Patent No. 272,029, granted to me February 13,1883.

In the class of machines referred to, the hoopto be dressed or operated. upon by the knife, is fed toward the said knife by rollers having their axes vertically in line with each other, the lower roller provided with a plastic or yielding surface covering, being independent of the upper roller and revolved by friction, thus forming a friction feed for the In practice it has been demon bar is so great (especially when the saidhoops are moist, sappy, or contain pitch) that a very considerable force is required to pull the hoops by hand through the machine, to again start it in operation.

It is the object of this invention to obviate.

the stopping of the progress of the hoop through the machine while the latter is in operation, and I accomplish my object by providing the machine with a positive feed adapted to adjust itself to hoops of varying thickness, and by means of a presser bar constructed as will be described, whereby the friction between the hoop and presser bar is reduced to a minimum.

The particular features in which my invention consists will be 'pointed out in the claim at the end of this specification.

Figure 1 is a longitudinal section of a hoop dressing machine embodying my invention.

line yy, and Fig. 6 a transverse section of Fig. 4 on line 'y'--y.

= The machine A provided with the plastic or yielding bed roll a, the cutter a, the hoop guide consisting of the frame a and vertical rollers a, the presser-foot a and its carrier bar a are all substantially as in the patent referred to.

In accordance with my invention the lower feed-roll b of plastic or yielding material has mounted upon its journal or shaft a toothed wheel or gear I) in mesh with and driven by a toothed wheel or gear 6 on the shaft of the upper feed roll 5 which in practice is driven positively in any usual or well known manner as 1n the patent referred to. The teeth of the Wheels or gears 1), 11 are made of considerable size to insure strength and are of considerable length to permit of the said gears being separated and yet remain in mesh, to enable the feed rolls to be separated by uneven thickness of the hoop fed therethrough and yet obtain a positive feed. As

herein shown the upper feed roll I) is movable and the lower feed roll I) stationary, the roll 19 having its shaft supported in boxes not shown, but which are'fitted in slots or recesses 1n the frame of the machine, the said roll being maintained in its normal position by sprlngs c pressing upon the boxes of the said shaft, only one of the said springs bein shown. a

The hoop, not shown, after being fed by the positive feed described, passes under the presser-foot a and beneath the knife or, the hoop belng supported on the roll a, which acts as a ylelding bed, and after passing be yond the said knife the said hoop passes under the rear presser bar B, grooved at its under face toreceive a roller 0 having its journals supported in boxes 0 adj ustably secured in the said groove by screws 0 0 the screws o being turned to raise and lower the boxes and roll c,-and the screws 0 securing the said boxes and roll in adjusted position. The roll 0 rests upon the hoop and thereby reduces the friction to a minimum. By

means of the slight resistance offered to the passage ofthe hoop through the machine by the presser bar, the positive feed is rendered? efiective to overcome resistances oifered to the passage of the hoop through the machine, I such as might arise from warts and protnberances on the hoop.

It will be seen that the dressing of hoops,

while filled with sa presents a substantially new art, or one unlike that hitherto followed with the employment of cylinder machines. The strokes of the knives upon the sappy wood, furnish the occasion for suction between the dressed surface and the flat portion of the presser. barasin no other manufacture known to me, and the irregular surface of the bark on the hoop presentf ing knots and warts causesthe stolpp'age of the hoop splints byfrietion with thejunder rolls upon which the hoop rests, the said:

friction being enhanced by the weight of the so that the knots or warts may pass along.

upper feed rolls, which must be lifted bodily.

These warts and knots are of such toughness that they are notcrushed nor indeed may they be crushed without damage. to the hoop. Gwing to the warts and knots, "or-dig nary gears were impracticable andit became, necessary to depart from the rules laid down 1 for the spacing of gears, and by exlperiment determine the form of thesaid gears. It will be seen that the teeth a'reof unusual 5 length and dimensions as it was found needful in passing certain knots and Watts between the feed rolls, that said rolls should be separated in some cases for thespace of an inch and the said gears still remaining in mesh with one another.

By providing the lower feed roll with a Q yielding surface diiferences in the thickness of the hoops can frequently be accommodated without forcing the upper feed roll bodily g'reater the strain'upon the gears.

away from the lower roll, the yielding surface also giwingafirmer hold upon thejhoop to feed it.

Were both rolls provided with unyielding surfaces the upper roll would be lifted bodily for everywa'rt o'r excres'ce'n'ce'on either side of theih'oop, which would be objectionable in the extreme, as the more the feed rolls are separated beyond the normal distance the Furthermore it was found necessary to strengthen the teeth of thegea-rsby means of collars b Fig. 2 as in "all 'case'swher'e' 'o'rd'inary'gears were =used-,' the *saidlsgears were broken even when made of hard or bell metal.

I have herein shown the gears b'.,b?, as applied to thefeedrollsonly, but in practice they willbesapplied to the drawing rollers d, d, at the rear of the machine.

The gears b 17%,fll'dfh8l'6ill shown as located inside the frame of the machi'ne, but in p ractice they willpireferablybe located on the outsidethereof',

'a cu-t ter, and a ,presser bar B having a roller cfrestin'gilpon thefls-tock, said roller being adjustableindependentlyof the said .p-resser bar substantially as and; for t pu po Specified. 7 e n In testimony wihereof Ihave signed my name to this specification in the presence of two subscribing witnesses.

HENRY F. CAMPBELL.

Witnesses:

JAS. H. CHURCHILL, J. O. SEARS. 

